Universal Vibrational Anharmonicity in Carbyne-like Materials

Autor(en)

Johannes M. A. Lechner, Pietro Marabotti, Lei Shi, Thomas Pichler, Carlo Spartaco Casari, Sebastian Heeg

Abstrakt

Carbyne, an infinite linear chain of carbon atoms, is the truly one-dimensional allotrope of carbon. While ideal carbyne and its fundamental properties have remained elusive, carbyne-like materials like carbyne chains confined inside carbon nanotubes are available for study. Here, we probe the longitudinal optical phonon (C-mode) of confined carbyne chains by Raman spectroscopy up to the third overtone. We observe a strong vibrational anharmonicity that increases with decreasing C-mode frequency, reaching up to 8% for the third overtone. Moreover, we find that the relation between vibrational anharmonicity and C-mode frequency is universal to carbyne-like materials, including ideal carbyne. This establishes experimentally that carbyne and related materials have pronounced anharmonic potential landscapes which must be included in the theoretical description of their structure and properties.

Organisation(en)

Elektronische Materialeigenschaften

Externe Organisation(en)

Humboldt-Universität zu Berlin, Sun Yat-sen University, Politecnico di Milano

Seiten

2410.14820

Anzahl der Seiten

22

Publikationsdatum

10-2024

ÖFOS 2012

103009 Festkörperphysik, 103018 Materialphysik, 103020 Oberflächenphysik

Schlagwörter

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/7fbd63a2-0158-462d-bcab-373d5a58ff17